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#include "vfsbridge.h"
#include "../fluorinepaths.h"
#include <algorithm>
#include <chrono>
#include <cstdint>
#include <cstdio>
#include <fstream>
#include <iomanip>
#include <ostream>
#include <sstream>
#include <system_error>
namespace
{
namespace fs = std::filesystem;
uint64_t hash64(const std::string& s)
{
uint64_t h = 1469598103934665603ULL;
for (unsigned char c : s) {
h ^= c;
h *= 1099511628211ULL;
}
return h;
}
std::string jsonEscape(const std::string& s)
{
std::ostringstream out;
out << '"';
for (unsigned char c : s) {
switch (c) {
case '"':
out << "\\\"";
break;
case '\\':
out << "\\\\";
break;
case '\b':
out << "\\b";
break;
case '\f':
out << "\\f";
break;
case '\n':
out << "\\n";
break;
case '\r':
out << "\\r";
break;
case '\t':
out << "\\t";
break;
default:
if (c < 0x20) {
out << "\\u" << std::hex << std::setw(4) << std::setfill('0')
<< static_cast<int>(c) << std::dec;
} else {
out << static_cast<char>(c);
}
break;
}
}
out << '"';
return out.str();
}
int64_t timeToNs(std::chrono::system_clock::time_point t)
{
return std::chrono::duration_cast<std::chrono::nanoseconds>(
t.time_since_epoch())
.count();
}
int64_t nowToNs()
{
return timeToNs(std::chrono::system_clock::now());
}
void writeMeta(std::ostream& out, const VfsTree& tree,
const std::string& data_dir, const std::string& overwrite_dir,
const std::string& mount_point)
{
out << "{\"record\":\"meta\","
<< "\"schema\":\"fluorine-vfs-index-v1\","
<< "\"data_dir\":" << jsonEscape(data_dir) << ','
<< "\"overwrite_dir\":" << jsonEscape(overwrite_dir) << ','
<< "\"mount_point\":" << jsonEscape(mount_point) << ','
<< "\"file_count\":" << tree.file_count << ','
<< "\"dir_count\":" << tree.dir_count << ','
<< "\"export_time_ns\":" << nowToNs() << "}\n";
}
void writeEntry(std::ostream& out, const std::string& virtual_path,
const VfsNode& node)
{
out << "{\"record\":\"entry\","
<< "\"type\":" << jsonEscape(node.is_directory ? "directory" : "file")
<< ",\"virtual_path\":" << jsonEscape(virtual_path);
if (!node.is_directory) {
const auto& fi = node.file_info;
out << ",\"real_path\":" << jsonEscape(fi.real_path)
<< ",\"real_path_kind\":"
<< jsonEscape(fi.is_backing ? "backing_relative" : "absolute")
<< ",\"origin\":" << jsonEscape(fi.origin)
<< ",\"size\":" << fi.size
<< ",\"mtime_ns\":" << timeToNs(fi.mtime)
<< ",\"is_backing\":" << (fi.is_backing ? "true" : "false");
}
out << "}\n";
}
std::size_t writeNode(std::ostream& out, const VfsNode& node,
const std::string& virtual_path)
{
std::size_t written = 0;
if (!virtual_path.empty()) {
writeEntry(out, virtual_path, node);
++written;
}
if (!node.is_directory) {
return written;
}
auto children = node.listChildren();
std::sort(children.begin(), children.end(),
[](const auto& a, const auto& b) {
return normalizeForLookup(a.first) < normalizeForLookup(b.first);
});
for (const auto& [displayName, child] : children) {
if (child == nullptr) {
continue;
}
std::string childPath = virtual_path;
if (!childPath.empty()) {
childPath += '/';
}
childPath += displayName;
written += writeNode(out, *child, childPath);
}
return written;
}
} // namespace
fs::path vfsBridgeIndexPath(
const std::string& data_dir, const std::string& overwrite_dir,
const std::vector<std::pair<std::string, std::string>>& mods)
{
std::string fp;
fp.reserve(4096);
fp += data_dir;
fp += '\0';
fp += overwrite_dir;
fp += '\0';
for (const auto& [name, path] : mods) {
fp += name;
fp += '\0';
fp += path;
fp += '\0';
}
char buf[32];
std::snprintf(buf, sizeof(buf), "%016llx.jsonl",
static_cast<unsigned long long>(hash64(fp)));
return fs::path(fluorineVfsBridgeDir().toStdString()) / buf;
}
VfsBridgeExportResult exportVfsBridgeIndex(
const VfsTree& tree, const fs::path& path, const std::string& data_dir,
const std::string& overwrite_dir, const std::string& mount_point)
{
VfsBridgeExportResult result;
result.path = path;
std::error_code ec;
fs::create_directories(path.parent_path(), ec);
if (ec) {
result.error = ec.message();
return result;
}
fs::path tmp = path;
tmp += ".tmp";
{
std::ofstream out(tmp, std::ios::trunc);
if (!out) {
result.error = "failed to open temporary index file";
return result;
}
writeMeta(out, tree, data_dir, overwrite_dir, mount_point);
result.records_written = writeNode(out, tree.root, {});
out.flush();
if (!out.good()) {
result.error = "failed while writing index file";
fs::remove(tmp, ec);
return result;
}
}
fs::rename(tmp, path, ec);
if (ec) {
fs::remove(path, ec);
ec.clear();
fs::rename(tmp, path, ec);
if (ec) {
result.error = ec.message();
fs::remove(tmp, ec);
return result;
}
}
result.ok = true;
return result;
}
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